Nonbilayer Films Prepared from Polyion Complexes of Amphiphilic Compounds

Abstract

Nonbilayer films (Fig.2 a and b) spontaneously formed during solvent cast of additives (type I in Fig.1) and polyion complexes (PIC) prepared from quaternary ammonium type amphiphiles, [CH₃(CH₂)_n-1]2N⁺(CH₃)₂⋅Br^-(2C_nN, n=16, 18, 20) and poly(p-styrenesulfonate)(PSS) or poly[2-(acrylamido)-2-methyl-l-propanesulfonate] (PAMPS). An important factor for the formation of nonbilayer structure was an increase in the molar volume of a hydrophobic part rather than hydrophilic part in the PICs by additives, but not chemical structure of additives.